If you place the core wae outside of the ASA then all WAAS optimizations will not take place.
The traffic will enter the WAE encrypted therefore only TFO and LZ compression will occur.
You can place the WAE inline between CORE switch and ASA prior to encryption taking place.
Replacing switches , routers to support PBR or WCCP is an option. However inline will provide easiest integration to customers existing network without introducing additional costs to better achieve ROI
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